Metal working machine



March 15, R, w. GLASNER ET L METAL WORKING MACHINE Filed Oct. 21. 1929 3 Sheets-Sheet l March 15, R w N R ET AL 1,849,711

METAL WORKING MACHINE Filed Oct. 21, 1929 3 Sheets-Sheet 2 MHHH &

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March 15, 1932. v w. GLASNER AL 1,849,711

METAL WORKING MACHINE Patented Mar. 15, 1932 UNITED STATES PATENT OFFICE RUDOLPH W. GLASfiER AND FREDRICH J. RODE, OF CHICAGO, ILLINOIS METAL WORKING MACHINE Application filed October 21, 1929. Serial No. 401,286.

This invention relates to improvements in metal working machines having a positive drive and fixed throw, and one of the objects of the invention is to provide in such a machine a yielding bed controlled by fluid pressure means and so constructed as to provide an auxiliary reservoir, which latter is embodied in and constitutes an integral part of the press, thereby eliminating the installment of accessories, such as separate tanks, piping, couplings and the like, with all of the objects and difficulties incident thereto.

A further object is to provide in a metal working machine of this character a bed having cushioning means directly opposite the lower riveting die, thereby eliminating the use of leverages for exerting a yielding pressure on the dies and also eliminating bending strains and stresses on such levers.

A further object of the invention is to provide an improved compact machine of this character having means for automatically compensating dilferent or varying thicknesses of the material being operated upon, and at the same time eliminating the necessity for the use of space for tanks and accessories in connection with the machine, with the further provision of yielding means to exert the proper blow necessary for the setting of rivets in a machine having a fixed throw.

To the attainment of these ends and the accomplishment of other new and useful objects as will appear, the invention consists in the features of novelty in substantially the construction, combination and arrangement of the several parts hereinafter more fully described and claimed and shown in the accompanying drawings illustrating this invention and in which Figure 1 is a vertical sectional view of a riveting machine of this character constructed in accordance with the principles of this invention, and showing the parts in one position and as taken on line 11, Figure 2.

Figure 2 is a left hand end elevation of Figure 1, with parts in elevation and parts broken away.

Figure 3 is a detail view in elevation as taken on line 33, Figure 2.

Figure 4: is a view in vertical section, partly in elevation and partly broken away, on 1 Referring more particularly to the drawings the numeral 10 designates generally the supporting structure of the machine, having a bed 11 provided with a bed plate 12 through which a pressure pad or die supporting memher 13 is movable. Supported by the frame of the machine is a cushioning device embodying a cylinder 14: in which a piston 15 reoiprocates and connected with the piston is a piston rod 16 to which the pressure pad or support 13 is secured and the piston rod passes through a suitable packing box 17.

Mounted upon the pad or support 13 is a lower riveting die 18 with which an upper riveting die 19 co-operates.

The machine frame is provided with an upright or standard 20 extending above the base 12 thereof, and in this standard is j ournaled anioperating shaft 21, which shaft is driven preferably by means of a gear wheel 22, through the medium of a gear 23 meshing therewith, and which gear 23 is connected with a shaft 24 journaled in suitable bearings 25, the shaft 21 being rotated in any suitable manner, preferably by means of a pulley 26 over which a belt or other driving means (not shown) passes, and which belt is driven from any suitable source of power.

Connected with the shaft 21 is an eccentric 27 with which an eccentric strap 28 is connected, and connected with the strap is an arm 29, which in turn is pivotally connected to a head 30. Depending from the head 30 are rods 31 which are connected to a slide 32, the latter moving upon a suitable guide 33 held by the upright or standard 20.

The slide 32 is connected with the rods 30 in any suitable manner preferably by means of the rods passing through bearings 34 with nuts or collars 35 engaging the threaded ends 36 of the rods and on opposite sides of the bearings 34.

Thus it will be seen that when the shaft 21 .is rotated the slide 32 together with the rivet-- ing die 19 carried thereby will be reciprocated and the extent of reciproeatory movement is such that when the rivets 37 (see Figure 1) which pass through the work 38 and rest upon the co-operating die 18, will be engaged by the end of the riveting die 19 and the rivets upset or fastened in position.

The die 18 is yieldingly resisted in its movement by means of the cushioning device comprising the cylinder and piston 14-15.

Arranged within and forming an integral part of the supporting structure of the machine is an auxiliary or supply tank 30 for holding a fluid 40, here shown as being a liquid, the tank 39 being provided with an ordinary indicator gage 41.

Leading from the tank 39, preferably adj acent its bottom, is a pipe 42 which has communication with a passage 43 in the cylinder 14 and this passage 43 has communication by means of a passage 44 with the cylinder 14 on the lower side of the piston 15.

The passage 43 is provided with a closure 45 and a valve 46 is provided which serves as a closure for the passage 44. The valve 46 is normally held against its seat preferably by means of a spring 47 and the valve also preferably co-operates with the end of a tubular member 48 through which the stem 49 of the valve freely passes.

The cylinder wall 14 is also provided with a passage 50 leading through the bottom thereof and this passage 50 communicates with another passage 51 formed in any suitable manner and the passage 51 has communication with a chamber 52. A tubular member 53 is preferably provided in the chamber 52 communicating with the passage 51 and having openings 54 so as not to obstruct the flow of fluid into and out of the chamber 52.

A valve 55 is provided for closing the passage 51 and this valve preferably has connected with it a piston 56 which operates in the tubular member 53 and forms a guide for the valve.

The valve is connected to a stem 57 which passes through a suitable support or bearing 58 and terminates in a cylinder 59.

Connected with the support 58 preferably by means of bars or rods 60 is a header or member 61, and supported by the latter is a piston 62 which is disposed within the cylinder 59.

A pipe 63 leading from any suitable source of supply of pressure fluid discharges through the piston 62 and into the cylinder 59 so that when a sufiicient pressure is obtained in the cylinder 59 beneath the piston, and as the piston stands still the fluid will move the cylinder 59, valve rod 57 and valve 55 in a direction. to seat the latter to close the opening 51.

So long as the pressure in the cylinder 59 exceeds the pressure created in the cylinder 14 by the piston 15 against the fluid 40 therein, the valve 55 will remain seated and the movement of the pad or support 13 and piston 15, the latter in the cylinder 14, will be resisted. When, however, the pressure created in the cylinder 14 by the movement of the piston 15 against the fluid 40 therein, exceeds the pressure in the cylinder 59, the valve 55 will be unseated so as to permit the fluid 40 to escape from the cylinder 14 through the passage 50, passage 51, past the valve 55 into the passage 43, thence to the passage 42 to be delivered back to the tank or reservoir 39.

It will therefore be manifest that by controlling the degree of pressure in the cylinder 49 the degree of resistance of the fluid 40 in the cylinder 14 against the movement of the piston 15 can be controlled.

To that end there is provided an automatic regulating valve 64 in the pipe 63 which may be of any desired or suitable type, a gage 65 and a check valve 66 being also provided, the latter preventing the return of the fluid through the pipe 63.

Fluid pressure is supplied to the tank or reservoir 39 above the liquid 40 therein preferably from the same supply pipe 63 and source of supply, through the medium of a pipe 67 which has communication with the tank or reservoir 39 above the liquid 40 there- 1n.

An automatically operating regulating valve 68, an indicator gage 69 and a check valve 70 may also be provided in the pipe 67.

It is thought that the operation of this riveting machine will be clearly understood from the foregoing, but briefly stated it is as follows. Assuming the parts to be in the position shown in Figure 1, that is in the normal position with the ram or slide 32 at the limit of its upward movement, the piston 15 will also be at the limit of its upward movement having been moved into such position by the fluid pressure in the tank or reservoir 39 upon the liquid 40 therein, such pressure causing the liquid to flow through the pipe 42 into the passage 43, thence through the passage 44 to unseat the valve 46 and into the cylinder 14 to raise the piston 15, it of ure 1, it will be manifest that when the rain or slide 32 descends to cause the riveting die 19 to co-operate with the die 18 to upset the rivets 37, the die 18 and supporting block or pad 13 together with the piston 15.will be resisted in its movement under such pressure by the pressure of the fluid 4:0 in the cylinder 14, as it will be manifest that as soon as the piston 15 begins to descend the valve 46 will be closed and the valve 55 will be maintained seated until the pressure in the cylinder 14 overcomes the pressure in the cylinder 59. At this time the liquid will be trapped in the cylinder 14 and cannot escape until the pressure in the cylinder 59 is overcome. When it is overcome the valve 55 will be unseated and the liquid will flow from the cylinder 14; back to the tank or reservoir 39 through the openings 50, 51, 43 and 42.

As soon as the ram or slide 32 starts to ascend the pressure in the reservoir or tank 39 above the liquid 40 will force the latter out of the tank through the pipe 42, into the passage 4-3, through the passage 44, to unseat the valve 46 and flow into the cylinder it to return the piston 15 and the die 18 with the structure supporting the latter tonormal position.

With this improved construction it will be manifest that there is provided in a rivetting machine yielding means to exert the proper blow for the correct setting for the rivets and the bed or support for the lower die will be yieldingly mounted and will be operated by fluid pressure. At the same time the tank or reservoir for providing such pressure and for returning the piston is embodied into the machine structure as a part and parcel thereof.

This structure also provides a cushioning apparatus directly opposite the lower riveting die, thereby eliminating the use of leverages for exerting yielding pressures on the dies, with the resulting bending stresses and strains on such levers.

Furthermore, with this construction all of the mechanism will be compactly arranged and all danger of causing leakage by reason of pipes and separate tanks will be obviated.

It will also be manifestrthat inasmuch as the slide or ram 32 operates with a set throw, the die 18 will automatically yield under the pressure of the die 19 to compensate variations in the thickness of the work being operated upon, but at the same time the die 18 will be held against movement to exert the proper blow necessary for the correct setting of the rivet.

While the preferred form of the invention has been herein shown and described, it is to be understood that various changes may be made in the details of construction and in the combination and arrangement of the several parts, within the scope of the claims, without departing from the spirit of this invention.

What is claimed as new is 1. In a metal working machine a movable die, a fluid pressure cushion for yieldingly resisting the movement of the said die in one direction, and a supplemental reservoir within the machine for containing fluid for said cushion, said reservoir being out of communication with said cushion during the operative stroke of the ram of the machine.

2. lln a metal working machine a movable die, a fluid pressure cushion for yieldingly resisting the movement of said die in one direction, a reservoir within and forming an integral part of the machine separate from said cushion, a liquid passage forming communication between the cushion and said reservoir, and means for closing said passage during the operative cycle of movement of the ram of the machine.

3. In a metal working machine a movable die, a fluid pressure cushion for yieldingly resisting the movement of said die in one direction, a reservoir within and forming an integral part oi? the machine separate from said cushion, a liquid passage forming communication between the cushion and said reservoir, and variable resistance pressure creating means closing said passage during the operative cycle of movement of the ram of the machine.

4-. In a metal working machine a movable die, a fluid pressure cushion for yieldingly resisting the movement of the said die in one direction, a reservoir separate from said cushion and forming an integral part of and being arranged within the machine, a fluid passage between the cushion and said reservoir, and means operating to cut ofi' communication between the cushion and said reservoir during the operative cycle of operative movement of the ram of the machine.

5. As a unitary structure in a metal working machine, a movable die, a fluid pressure cushion for maintaining said die in an operative position during a normal operation of the machine and for yieldingly resisting the movement of the die during an abnormal operation of the machine, and an auxiliary reservoir constituting an integral part of the machine, said reservoir supplying fluid to and receiving fluid from said cushion.

6. As a unitary structure in a metal working machine, a movable die, a fluid pressure cushion for maintaining said die in an operative position during a normal operation of the machine and for yieldingly resisting the movement of the die during an abnormal operation of the machine, an auxiliary reservoir constituting an integral part of the machine, said reservoir supplying fluid to and receiving fluid from said cushion, and varis v able resistance ressure creating means for controlling the uid pressure in said cushion. In testimony whereof we have signed our names to this s%ecification, on this 17th day of October, A. 1929.

RUDOLPH W. GLASNER.

FRIEDRICH J. RODE. 

